Electronic timepiece with electrochromic display
US4443115A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1981 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Jan 2, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04G9/0029
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electronic timepiece provided with an electrochromic display device as a time related information display. The ECD is driven by an electric charge transfer method. The electric charges which cause coloration of segments directly transfer from non-selected segments to selected segments. In the ECD additional concealed dummy segments temporally store the excess electric charges when the total area of the selected segments decreases, and release the stored electric charges when the total area of the selected segments increases, so that the electric charge density of colorized segment is always kept constant. Moreover electric charges are periodically supplied to the display device so as to compensate the lost amount which was dissipated during transfer cycle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.